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UM1995-02-CO:BaCaClFKMgNaSr

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Formula:
(Na2,Ba,Ca,Sr,Mg,K2)(CO3)
assuming this is a carbonate (as suggested by relatively intense C peak in the XR spectrum); large chemical variations are noticed
Reported as "phase X": a Ba-Ca-Sr-Na-rich mineral, associated with coarse-grained immiscible portion of natrocarbonatite groundmass.

Occurs as irregular patches (30-50 microns in diameter) as: (1) rims of sylvite-gregoryite globules, or (2)rims of nyerereite phenocrystals. May poikilitically include apatite group and neighborite.

XR-EDS (with Super ATW Light Element Detector) results, wt.% (ranges, 8 analyses): FeO not analyzed (n.a.) / not detected (n.d.) - 0.13, MnO n.a./n.d. - 0.37, MgO 0.75-3.72, CaO 6.71-30.75, SrO 5.76-9.10, BaO 18.58-44.83, Na2O 2.36-10.54, K2O 2.18-8.42, La2O3 n.a. - 1.11, Cl 1.01-3.63 (assumed to be coming from the surrounding sylvite), F n.d. - 3.38, total 67.71-78.81.


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Unique IdentifiersHide

Mindat ID:
53534
Long-form identifier:
mindat:1:1:53534:4

Chemistry of UM1995-02-CO:BaCaClFKMgNaSrHide

Mindat Formula:
(Na2,Ba,Ca,Sr,Mg,K2)(CO3)

assuming this is a carbonate (as suggested by relatively intense C peak in the XR spectrum); large chemical variations are noticed
Element Weights:
Element% weight
O45.286 %
Na43.382 %
C11.332 %

Calculated from ideal end-member formula.
Elements listed:
Ba, C, Ca, K, Mg, Na, O, Sr - search for minerals with similar chemistry

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for UM1995-02-CO:BaCaClFKMgNaSrHide

References for UM1995-02-CO:BaCaClFKMgNaSrHide

Localities for UM1995-02-CO:BaCaClFKMgNaSrHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Tanzania
 
  • Arusha region
    • Ngorongoro District
Mitchell (1997)
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